Hartry Field

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nominalism

...long explanation of why mathematics is pragmatically useful and intellectually interesting despite the fact that it is not literally true. Fictionalism was first proposed by the American philosopher
Hartry Field. It was then developed in a somewhat different way by Balaguer, the American philosopher Gideon Rosen, and the Canadian philosopher Stephen Yablo.

...to reinterpret or reconstruct mathematical theories in ways which avoid reference to abstracta have not met with conspicuous success. Following a more radical course, the American philosopher
Hartry Field has argued that nominalists can accept mathematical theories under certain conditions while denying that they are true. They can be accepted provided that they are...